Former Democratic aide pleads guilty to doxing GOP senators attending Kavanaugh hearing

A former congressional Democratic staff member pleaded guilty on Friday to posting private information about Republican senators who took part in the hearings on sexual assault allegations against then-Supreme Court nominee Brett KavanaughBrett Michael KavanaughKavanaugh book co-author admits to writing 'misworded' NY Times tweet The Hill's 12:30 Report: Trump heads to California Trump calls New York Times 'a very sad joke all over the world' MORE.

Jackson Cosko, 27, pleaded guilty to two counts of making public restricted personal information and one count each of computer fraud, witness tampering and obstruction of justice, The Washington Post reported.

The five federal felony counts carry maximum penalties up to 20 years in prison. In accordance with a plea agreement, prosecutors said a sentencing range of 46 to 57 months applied under federal guidelines.

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Cosko, who has served about four months in jail since he was charged, will be sentenced on June 13, the newspaper noted.

The agreement comes after Cosko was accused of releasing the private information of five Republican senators last year.

Cosko was reportedly upset after he had been fired from the office of Sen. Maggie HassanMargaret (Maggie) HassanOvernight Health Care: Juul's lobbying efforts fall short as Trump moves to ban flavored e-cigarettes | Facebook removes fact check from anti-abortion video after criticism | Poll: Most Democrats want presidential candidate who would build on ObamaCare Lawmakers weigh responses to rash of ransomware attacks Hillicon Valley: Google to pay 0M to settle child privacy charges against YouTube | Tech giants huddle with intel officials on election security | Top IT official names China main cyber threat MORE (D-N.H.) in May. He said in court filings that he had "engaged in an extraordinarily extensive data theft scheme" by burglarizing the office several times after his ouster to steal sensitive information he could use later.

According to the Post, Cosko said he "became angry" on Sept. 27 as he watched Kavanaugh, President TrumpDonald John TrumpBusiness, ballots and battling opioids: Why the Universal Postal Union benefits the US Sanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth MORE’s then-Supreme Court nominee, testify before the Senate Judiciary Committee. Kavanaugh's hearing came after he was accused of sexual assault by Christine Blasey Ford.

Ford testified before the Senate panel in late September that she had been assaulted by Kavanaugh when they were in high school in the 1980s. He vehemently denied Ford's and two other women's allegations in his own subsequent hearing.

Cosko admitted to the court that he responded to the contentious hearings by anonymously editing the Wikipedia pages of five Republican senators to add their phone numbers and home addresses, according to the Post.

The information was quickly removed when it was discovered, and aides contacted authorities.

Cosko said the group included GOP Senate Judiciary Committee members Lindsey GrahamLindsey Olin GrahamWe've lost sight of the real scandal The Hill's Morning Report - What is Trump's next move on Iran? The Memo: Times correction gives GOP lifeline in latest Kavanaugh controversy MORE (S.C.), Mike LeeMichael (Mike) Shumway LeeExclusive: Kushner tells GOP it needs to unify behind immigration plan Manufacturing group leads coalition to urge Congress to reauthorize Ex-Im Bank Overnight Defense: GOP grumbles after Trump delays military projects for wall | House panel hints at subpoena for Afghanistan envoy | Kabul bombing raises doubts about Taliban talks MORE (Utah) and Orrin HatchOrrin Grant HatchTrump to award racing legend Roger Penske with Presidential Medal of Freedom Trump awards Presidential Medal of Freedom to economist, former Reagan adviser Arthur Laffer Second ex-Senate staffer charged in aiding doxxing of GOP senators MORE (Utah) as well as Sen. Rand PaulRandal (Rand) Howard PaulRand Paul: Almost every mass shooter 'is sending off signals' Liz Cheney says world is more stable, 'safer' under Trump Sunday shows preview: Democratic candidates make the rounds after debate MORE (R-Ky.) and Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellHillary Clinton: Voter suppression has led to 'crisis in democracy' in the US New York Times authors blame Kavanaugh correction on editing error: 'There was zero intent to mislead' The Hill's Morning Report - What is Trump's next move on Iran? MORE (R-Ky.).

Cosko was caught sneaking into Hassan’s office after 10 p.m.  to log on to an aide’s computer. He was recognized by another staffer and ordered to leave, according to court papers.

The other aide then received a threatening email minutes later with the subject line "I own Everything." The message reportedly stated, "If you tell anyone I will leak it all. Emails signal conversations gmails. Senators children’s health information and socials," according to plea papers reviewed by the Post.

Cosko was arrested on Oct. 3.